基于话音频谱分析的综合静噪设计

Integrated Squelch Design based on Voice Spectral Analysis

短波通信因其结构简单、传输可靠、传播距离远,在军事、应急救灾中占据着重要地位。良好的静噪性能是衡量短波接收机性能的重要指标。于是,先后提出一种利用话音频谱特性实现静噪的方法、一种基于带内外平均能量比较来实现静噪的方法以及一种基于时域过零点统计比较来实现静噪的方法。仿真结果表明,3种检测方法结合的综合静噪算法具有高话音检出成功率,且具有低虚警、漏警概率,显著提升了短波接收机的静噪性能。

For its simple structure,reliable communication and long transmission distance,HF communication occupies a pivotal position in the military and emergency rescue.Good squelch performance is an important indicator in measuring the performance of HF receiver.Therefore,three methods are proposed:with spectral characteristics of the voice to achieve the squelch;based on the comparison with internal and external average energy to achieve the squelch;and based on the comparison of zero-crossing time-domain statistics to achieve squelch.The simulation results indicate that the integrated muting algorithm combined with the three detection methods has the advantages of high voice-detection success rate,low false alarm and missed-alarm probability,and could significantly improve the muting performance of the HF receiver.